iOS键盘通知

新风作浪2015-08-212024-01-13

iOS系统键盘通知

UIKeyboardWillShowNotification      // 键盘将要出现
UIKeyboardDidShowNotification       // 键盘已经出现
UIKeyboardWillHideNotification      // 键盘将要消失
UIKeyboardDidHideNotification       // 键盘已经消失
UIKeyboardWillChangeFrameNotification   // 键盘frame将要修改
UIKeyboardDidChangeFrameNotification    // 键盘frame已经修改

键盘通知事件里获取userInfo key

UIKeyboardFrameBeginUserInfoKey         // 开始时的键盘位置
UIKeyboardFrameEndUserInfoKey           // 结束时的键盘位置
UIKeyboardAnimationCurveUserInfoKey     // 动画类型
UIKeyboardAnimationDurationUserInfoKey  // 动画持续事件
UIKeyboardIsLocalUserInfoKey            // 是否为本地用户键盘
UIKeyboardCenterBeginUserInfoKey        // 开始时的键盘中心
UIKeyboardCenterEndUserInfoKey          // 结束时的键盘中心
UIKeyboardBoundsUserInfoKey             // 键盘边界

关于iPad浮动键盘

在iPad上键盘可以拆分和浮动，在拆分和浮动情况下 UIKeyboardWillShowNotification 、 UIKeyboardWillHideNotification 两个通知并会触发，需要通过监听UIKeyboardWillChangeFrameNotification 或者UIKeyboardDidChangeFrameNotification 获取键盘的一些变化。

[[NSNotificationCenter defaultCenter] addObserverForName:UIKeyboardDidChangeFrameNotification object:nil queue:[NSOperationQueue mainQueue] usingBlock:^(NSNotification * notification) {
            CGRect keyboardEndFrame = [[notification.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
            CGRect screenRect = [[UIScreen mainScreen] bounds];
            if (CGRectIntersectsRect(keyboardEndFrame, screenRect)) {
                // 键盘显示
            } else {
                // 键盘隐藏
            }
        }];